S&J Hardware Mossberg MK II MagazineTube Extensions. CNC Milled from a solid block of 4140 steel. Bead Blasted Nitride Black or Satin Nickle Nitride
Comes with:
- 3 position front sling mount.
- 600,000 cycle count spring
- No Jam CNC Machined Mag follower
+1 tube length is 2.75″
+2 is 4.75″ and is designed for pre 2017 590/590a1 or 835